How Much Caffeine Is In Green Tea vs Coffee? | Real Numbers

“Tea” and “coffee” are categories, not measurements. The caffeine you get depends on how much you brewed, how long water touched the leaf or grounds, and how big the final drink is. A mild green tea can feel gentle. A strong pour-over can hit fast. A matcha latte can land closer to coffee when the scoop is heavy.

This article gives you realistic ranges, then shows the few brewing knobs that change caffeine most, so you can pick a drink that fits your day.

How Much Caffeine Is In Green Tea vs Coffee?

What caffeine amounts look like in a normal mug

In a plain 8-ounce (240 ml) cup, brewed green tea often lands around 20–45 mg of caffeine. Brewed coffee often lands around 80–100 mg. Those ranges shift by brand and recipe, yet they’re a useful starting point.

• Big cups raise totals fast. A 16-ounce mug can double caffeine without changing the drink name.
• Strong brews raise totals fast. More leaf or more grounds means more caffeine available to pull into the cup.

Why green tea and coffee vary cup to cup

Caffeine dissolves into water quickly, so concentration and contact time do most of the work. These are the drivers that change your result the most.

How much leaf or grounds you use

A “light” tea bag might hold around 1.5–2 grams of leaf. Loose-leaf scoops can run higher. Coffee recipes swing wider, from thin drip ratios to strong AeroPress doses.

How long you steep or brew

Green tea might steep for 90 seconds or 4 minutes. Coffee might run as espresso in under a minute, or sit as cold brew for hours. Longer contact usually pulls more caffeine.

Drink style

Matcha is powdered tea you consume, not leaf you discard. Espresso is concentrated but served in a small volume. Cold brew may be sold as a concentrate, then diluted.

For a plain-language reference on common caffeine sources and daily intake limits for most healthy adults, see FDA “Spilling the Beans” on caffeine.

Green tea versus coffee caffeine levels by brew style

Comparing typical styles is more useful than arguing “tea vs coffee” in the abstract. The ranges below assume everyday recipes, not specialty shop extremes.

When you want a reference number for a specific drink style, the USDA FoodData Central database is a good place to compare brewed tea and coffee entries by volume.

One more wrinkle: “green tea” includes many products. A light supermarket bag, a shade-grown loose leaf, and a bottled green tea drink can sit far apart. Shade-grown teas such as gyokuro often start with a higher caffeine content in the leaf, and bottled teas may list caffeine on the label, which can be handy when the recipe is unknown.

Coffee has its own spread. Beans sold as canephora tend to carry more caffeine than arabica, and some “extra-caffeinated” blends mix canephora in on purpose. Grind size and brew method also change extraction. A slow drip through fine grounds can yield a stronger cup than a fast flow through coarse grounds, even at the same volume.

Green tea: bags, loose leaf, and matcha

Brewed green tea from a bag, steeped 2–3 minutes, often sits around 20–35 mg per 8 ounces. Loose leaf can rise with a larger dose or longer steep. Matcha often lands around 30–70 mg per serving, depending on how much powder you whisk in.

Coffee: drip, espresso, and cold brew

Drip coffee in an 8-ounce cup often sits around 80–100 mg. A single 1-ounce espresso shot is smaller but concentrated, often around 60–70 mg. Ready-to-drink cold brew often lands near drip coffee, or higher when served strong.

Use this snapshot as a starting point, then adjust for your mug and your recipe.

If you’re ordering out, ask one thing: how many ounces are in the cup. Shops often use 12, 16, or 20 ounces as a default. That single detail can tell you more about caffeine than the drink name on the menu.

Drink and serving	Typical caffeine range	What changes it most
Brewed green tea, 8 oz	20–45 mg	Leaf dose, steep time
Green tea, 16 oz mug	40–90 mg	Cup size, steep time
Matcha, 1 tsp powder	30–70 mg	Scoop size, latte dilution
Brewed coffee, 8 oz	80–100 mg	Ground dose, brew ratio
Brewed coffee, 12–16 oz	120–200 mg	Serving size, shop recipe
Espresso, 1 shot (1 oz)	60–70 mg	Shot size, blend
Cold brew, 12 oz	120–200+ mg	Concentrate strength, dilution
Decaf coffee, 8 oz	2–15 mg	Decaf process, brew strength

How to estimate caffeine in your cup

You can get close with three simple moves: pick a baseline, scale by cup size, then adjust for brew strength.

Pick a baseline per 8 ounces

• Green tea: 30 mg per 8 oz is a solid middle value.
• Brewed coffee: 95 mg per 8 oz is a common reference point.

Scale by your cup

Drink 16 ounces? Double the baseline. Drink 6 ounces? Multiply by 0.75. This alone explains why café drinks can feel stronger than home cups.

Adjust for strength

If you doubled the scoops, expect a big jump. If you steeped green tea for a short time, expect a drop. If you’re unsure, treat “strong” as +25% and “light” as −25% as a rough rule of thumb.

Mayo Clinic’s overview is a helpful second reference for caffeine ranges and typical daily limits for adults: Mayo Clinic’s caffeine overview.

Reading labels on bottled tea and canned coffee

Packaged drinks can be the easiest place to get a number, since many brands print caffeine per bottle or per serving. Still, watch the serving math. A can may list caffeine for “one serving” while the container holds two. Also check whether the drink is a concentrate meant to be mixed with water or milk.

If the label doesn’t list caffeine, treat sweetened bottled tea as a wildcard. Some are brewed lightly and sit low. Others use tea extract and can land closer to coffee. When you can’t find a number, the safest bet is to start with a smaller portion, then see how you feel.

When green tea can rival coffee

Coffee usually wins per typical cup, yet green tea can close the gap in a few common scenarios.

Matcha with a heavy scoop

Two teaspoons of matcha can push caffeine well above a single bag of brewed green tea. If you add extra powder to smoothies or lattes, treat it like a concentrated drink.

Many cups over a morning

Green tea is easy to sip. Two or three cups can stack up to a full coffee dose without feeling intense in any single moment.

Small coffee servings

A small 4–6 ounce home cup can sit close to a big mug of green tea. The drink name stays the same. The volume doesn’t.

How caffeine can feel different between tea and coffee

Caffeine is the same molecule, yet the experience can differ. Green tea contains L-theanine, an amino acid that some people say smooths the stimulation. That doesn’t mean green tea has less caffeine; it means the mix of compounds differs.

If you want the safety science behind caffeine intake thresholds, the European Food Safety Authority’s opinion is a strong reference point: EFSA scientific opinion on caffeine.

How to lower caffeine without ditching your drink

Small tweaks can drop caffeine while keeping the taste you like.

Green tea tweaks

• Shorten the steep. Try 90 seconds, then add 30 seconds next time if needed.
• Use a smaller dose. A level teaspoon of loose leaf is often enough for an 8-ounce cup.
• Re-steep the same leaves. The second steep often has less caffeine than the first.

Coffee tweaks

• Pour a smaller cup. Size changes the total more than roast color.
• Blend with decaf. A half-caf mix keeps coffee flavor with a lower dose.
• Dilute cold brew concentrate. Mix to the maker’s ratio before you treat it as a serving.

Quick comparison table for common orders

This table puts typical café-style choices side by side. Treat the ranges as likely averages, not guarantees.

What you drink	Serving size	Likely caffeine range
Green tea bag, normal steep	8 oz	20–35 mg
Green tea, large mug	16 oz	40–70 mg
Matcha latte, standard scoop	12 oz	50–90 mg
Drip coffee, home mug	8 oz	80–100 mg
Drip coffee, café cup	12–16 oz	120–200 mg
Espresso, single shot	1 oz	60–70 mg
Cold brew, ready-to-drink	12 oz	120–200+ mg

Timing tips if caffeine messes with sleep

Some people can drink coffee after dinner and fall asleep. Others feel it from a mid-afternoon tea. If you’re in the second group, move your last caffeinated drink earlier and swap to decaf or herbal tea later. A smaller cup can also beat a full switch in drink type, since dose is often the main issue.

If you’re tracking your pattern for a week, add one note: how you slept. You may spot that a 16-ounce coffee at 2 p.m. hits you differently than an 8-ounce green tea at 10 a.m.

What to do with this info the next time you brew

If you want the higher caffeine drink per typical cup, brewed coffee usually wins. If you want a smaller dose that’s easy to pace, brewed green tea fits well. If you drink matcha, the scoop decides the strength.

Try a one-week check-in: write down drink type, cup size, and the time you had it. Once you see your personal sweet spot, repeating it gets easy.